mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Math
synced 2024-12-18 10:30:51 +00:00
636f96d3bb
$wgUseTeX is not needed in the extension. For backwards compatibility, it's also set in /mediawiki/includes/DefaultSettings.php and used in /mediawiki/includes/EditPage.php only. Change-Id: Ie5bcabf9e2e7474a4d41d1efcc5072c144640388
124 lines
4.4 KiB
Plaintext
124 lines
4.4 KiB
Plaintext
== About texvc ==
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texvc takes LaTeX-compatible equations and produces formatted output in HTML,
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MathML, and (via LaTeX/dvipng) rasterized PNG images.
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Input data is parsed and scrutinized for safety, and the output includes an
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estimate of whether the code is simple enough that HTML rendering will look
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acceptable.
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The program was written by Tomasz Wegrzanowski for use with MediaWiki; it's
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included as part of the MediaWiki package (http://www.mediawiki.org) and is
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under the GPL license.
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Please report bugs at: https://bugzilla.wikimedia.org/
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with "MediaWiki extensions" as product and "Math" as component.
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== Setup ==
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=== Requirements ===
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OCaml 3.06 or later is required to compile texvc; this can be acquired from
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http://caml.inria.fr/ if your system doesn't have it available.
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The makefile requires GNU make.
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Rasterization is done via LaTeX, dvipng. These need to be installed and in
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the PATH: latex, dvipng
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AMS* packages for LaTeX also need to be installed. Without AMS* some equations
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will render correctly while others won't render. Most distributions of TeX
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already contain AMS*. In Debian/Ubuntu you need to install tetex-extra.
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To work properly with rendering non-ASCII Unicode characters, a supplemental TeX
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package is needed (cjk-latex in Debian)
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In Ubuntu Precise, all dependencies can be installed using:
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$ sudo apt-get install build-essential dvipng ocaml \
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texlive-fonts-recommended texlive-lang-greek texlive-latex-recommended
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=== Installation ===
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Run 'make' (or 'gmake' if GNU make is not your default make). This should
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produce the texvc executable.
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By default, MediaWiki will search in this directory for texvc, if you moved it elsewhere,
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you'll have to modify $wgTexvc and set it to the path of the texvc executable.
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== Usage ==
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Normally texvc is called from MediaWiki's Math.php modules and everything
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Just Works. It can be run manually for testing or for use in another app.
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=== Command-line parameters ===
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texvc <temp directory> <output directory> <TeX code> <encoding> <color>
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Be sure to properly quote the TeX code!
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Example:
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texvc /home/wiki/tmp /home/wiki/math "y=x+2" iso-8859-1 "rgb 1.0 1.0 1.0"
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=== Output format ===
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Status codes and HTML/MathML transformations are returned on stdout.
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A rasterized PNG file will be written to the output directory, named
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for the MD5 hash code.
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texvc output format is like this:
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+%5 ok, but not html or mathml
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c%5%h ok, conservative html, no mathml
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m%5%h ok, moderate html, no mathml
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l%5%h ok, liberal html, no mathml
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C%5%h\0%m ok, conservative html, with mathml
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M%5%h\0%m ok, moderate html, with mathml
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L%5%h\0%m ok, liberal html, with mathml
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X%5%m ok, no html, with mathml
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S syntax error
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E lexing error
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F%s unknown function %s
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- other error
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\0 - null character
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%5 - md5, 32 hex characters
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%h - html code, without \0 characters
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%m - mathml code, without \0 characters
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== Troubleshooting ==
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Unfortunately, many error conditions with rasterization are not well reported.
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texvc will return as though everything is successful, and the only obvious
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sign of problems for the user is a big X on a wiki page where an equation
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should be.
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Try running texvc from the command line to ensure that the software it relies
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upon is all set up.
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Ensure that the temporary and math directories exist and can be written to by
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the user account the web server runs under; if you don't control the server,
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you may have to make them world-writable.
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If some equations render correctly while others don't, you probably don't have
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AMS* packages for LaTeX installed. Most distributions of TeX come with AMS*.
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In Debian/Ubuntu AMS* is in tetex-extra package.
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To check if that is the problem you can try those two equations:
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x + y
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x \implies y
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The first uses only standard LaTeX, while the second uses symbol \implies from AMS*.
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If the first renders, but the second doesn't, you need to install AMS*.
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== Hacking ==
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Before you start hacking on the math package its good to know the workflow,
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which is basically:
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1. texvc gets called by Math/Math.body.php (check out the line begining with "$cmd")
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2. texvc does its magic, which is basically to check for invalid latex code.
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3. texvc takes the user input if valid and creates a latex file containing it, see
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get_preface in texutil.ml
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4. dvipng(1) gets called to create a .png file
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See render.ml for this process (commenting out the removal of
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the temporary file is useful for debugging).
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